ଚତୁର୍ଭୁଜ

ଯୁକ୍ଲିଡୀୟ ଜ୍ୟାମିତି ଅନୁସାରେ ଚତୁର୍ଭୁଜ ହେଉଛି, ଚାରି 'ବାହୁ' ଓ ଚାରି 'କୋଣ' ଥିବା ଏକ ବହୁଭୂଜ । ଏହା ସରଳ (କୌଣସି ବାହୁ ପରସ୍ପରକୁ ଛେଦ କରିନଥାନ୍ତି) କିମ୍ବା ଜଟିଳ (କୌଣସି ଦୁଇ ବାହୁ ପରସ୍ପରକୁ ଛେଦ କରିଥାନ୍ତି) ହେଇପାରେ । ସରଳ ଚତୁର୍ଭୁଜ, ଉତ୍ତଳ କିମ୍ବା ଅବତଳ ହେଇପାରେ ।

Quadrilateral
Six different types of quadrilaterals
Edges and vertices	4
Schläfli symbol	{4} (for square)
Area	various methods; see below
Internal angle (degrees)	90° (for square and rectangle)

ଏହାର ଚାରି କୋଣର ସମଷ୍ଟି: ${\displaystyle \angle A+\angle B+\angle C+\angle D=360^{\circ }.}$

 

ଉଇକିମିଡ଼ିଆ କମନ୍ସରେ Tetragons ବାବଦରେ ମାଧ୍ୟମ ରହିଛି ।

• Weisstein, Eric W., "Quadrilateral", MathWorld.
• Encyclopedia of Quadri-Figures by Chris Van Tienhoven
• Compendium Geometry Analytic Geometry of Quadrilaterals
• Quadrilaterals Formed by Perpendicular Bisectors, Projective Collinearity and Interactive Classification of Quadrilaterals from cut-the-knot
• Definitions and examples of quadrilaterals and Definition and properties of tetragons from Mathopenref
• A (dynamic) Hierarchical Quadrilateral Tree at Dynamic Geometry Sketches
• An extended classification of quadrilaterals Archived 2019-12-30 at the Wayback Machine. at Dynamic Math Learning Homepage Archived 2018-08-25 at the Wayback Machine.
• Quadrilateral Venn Diagram Archived 2011-09-07 at the Wayback Machine. Quadrilaterals expressed in the form of a Venn diagram, where the areas are also the shape of the quadrilateral they describe.
• The role and function of a hierarchical classification of quadrilaterals Archived 2011-07-19 at the Wayback Machine. by Michael de Villiers